《Isaac Asimov's Robots and Aliens 2 》作者：- Robert Thurston

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ISAAC ASIMOV’S ROBOT CITY ??B style='color:white;background-color:#00aa00'>2 ROBOTS AND ALIENS ??B style='color:white;background-color:#00aa00'>2 Intruder by Robert Thurston ??B style='color:white;background-color:#00aa00'>2 Copyright ?? 1990 ??B style='color:white;background-color:#00aa00'>2 ??B style='color:white;background-color:#00aa00'>2 For My Lovely Ladies, Rosemary and Charlotte ??B style='color:white;background-color:#00aa00'>2 ??B style='color:white;background-color:#00aa00'>2 WHAT IS A HUMAN BEING? ISAAC ASIMOV ??B style='color:white;background-color:#00aa00'>2 It sounds like a simple question. Biologically, a human being is a member of the species Homo sapiens. If we agree that one particular organism (say, a male) is a human being, then any female with which he can breed is also a human being. And any males with whom any of these females can breed are also human beings. This instantly marks up billions of organisms on Earth as human beings. It may be that there are organisms that are too old to breed, or too young, or too imperfect in one way or another, but who resemble human beings more than they resemble any other species. They, too, are human beings. We thus end up with something over 5 billion human beings on Earth right now, and perhaps 60 billion who have lived on Earth since